\(\Leftrightarrow\left(x-1\right)\left(x^2+x+1\right)=0\\ \Leftrightarrow x=1\left(x^2+x+1=\left(x+\dfrac{1}{2}\right)^2+\dfrac{3}{4}>0\right)\)
\(x^3-1=0\)
\(\Leftrightarrow x^3=1\)
hay x=1
Tìm x , biết :
a. \(\left(x-2\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+6\left(x+1\right)^2=15\)
b. \(2x^3-50x=0\)
c.\(5x^2-4\left(x^2-2x+1\right)-5=0\)
d. \(x^3-x=0\)
e. \(27x^3-27x^2+9x-1=1\)
Tìm x a, (x+4)^2-(x+1)(x-1)=19 b, (2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
Tìm x:
a)x^3+1=0
b)6x^2-12x-48=0
Tìm x: (x-3)(x^2+3x+9)+x(x+2)(2-x)=0
Cho a+b+c=0. CMR: a3 + b3 + c3 = 3abc
rồi sau đó áp dụng: Tìm x, biết: (2x-2023)3 + (2020-x)3 + (23-x)3 = 0
Tìm x
a, x\(^2\)+12x+36=0
b, x\(^2\)-1=0
c, 25x\(^2\)-9=0
Bài 3: tìm x biết:
A) 16x^ ^ 2-(4x-5)^ ^ 2=0
B) (x+1)^ ^ 2-2(x^ ^ 2-1)+ (x-1)^ ^ 2=0
C) x^ ^ 3-8=0
D) 27x^ ^ 3+1/27=0
E) (3x+5)^ ^ 2-16=0
Tìm x biết:
a) (x-3).(x2+3x+9) + (x+2).(2-x) = 1
b) x3-8-(x-2).(x2+3) = 0
c) (2x+1)3-(x-2)3 = 0
1. Tìm x :
a) ( 2x-1 ) ( -x+2 ) - 2x2 = 0
b) ( x-1 ) (x-3) (x+1) - ( x-4 ) (x2-1) = 0
c) ( 2x - 5 )- x2 - 25 = 0
